[OH:1][B:2]1[C:6]2[CH:7]=[CH:8][C:9]([CH:11]=[N:12][OH:13])=[CH:10][C:5]=2[C:4]([CH3:15])([CH3:14])[O:3]1.C1C(=O)N([Cl:23])C(=O)C1>CN(C=O)C>[OH:13]/[N:12]=[C:11](\[Cl:23])/[C:9]1[CH:8]=[CH:7][C:6]2[B:2]([OH:1])[O:3][C:4]([CH3:15])([CH3:14])[C:5]=2[CH:10]=1To a solution of 1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde oxime (1.38 g, 6.73 mmol) in DMF (15 mL) at rt was added NCS (1.07 g, 8.03 mmol). The reaction mixture was warmed to 45° C., stirred for 3 h and cooled to rt. The mixture was poured into ice-water (20 mL) and extracted with EA (20 mL×2). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to give the desired product (1.7 g; 100% yield) as a white solid.
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